US4410314A - Endless power transmission V-belt construction and method of making the same - Google Patents

Endless power transmission V-belt construction and method of making the same Download PDF

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Publication number
US4410314A
US4410314A US06/348,106 US34810682A US4410314A US 4410314 A US4410314 A US 4410314A US 34810682 A US34810682 A US 34810682A US 4410314 A US4410314 A US 4410314A
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US
United States
Prior art keywords
approximately
belt construction
inch
belt
set forth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/348,106
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English (en)
Inventor
Joseph P. Miranti, Jr.
Mark P. Foley
Gerald C. Hollaway
Larry R. Oliver
Paul M. Standley
James A. Lewis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dayco Products LLC
Original Assignee
Dayco Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Assigned to DAYCO CORPORATION, A CORP. OF DE. reassignment DAYCO CORPORATION, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FOLEY, MARK P., HOLLAWAY, GERALD C., LEWIS, JAMES A., MIRANTI, JOSEPH P. JR., OLIVER, LARRY R., STANDLEY, PAUL M.
Priority to US06/348,106 priority Critical patent/US4410314A/en
Application filed by Dayco Corp filed Critical Dayco Corp
Priority to EP83901127A priority patent/EP0100361B1/en
Priority to JP58501218A priority patent/JPS59500007A/ja
Priority to PCT/US1983/000195 priority patent/WO1983002809A1/en
Priority to GB08324225A priority patent/GB2125143B/en
Priority to DE833332118T priority patent/DE3332118T1/de
Assigned to DAYCO CORPORATION reassignment DAYCO CORPORATION CERTIFICATE BY THE SECRETARY OF STATE OF MICHIGAN SHOWING MERGER OF COMPANIES, AND CHANGE OF NAME OF THE SURVIVING CORPORATION. Assignors: DAYCO CORPORATION (MERGED INTO), DAYCO CORPORATION OF MICHIGAN (CHANGED TO)
Priority to US06/522,422 priority patent/US4494947A/en
Priority to SE8305589A priority patent/SE8305589L/
Publication of US4410314A publication Critical patent/US4410314A/en
Application granted granted Critical
Priority to US06/654,830 priority patent/US4559029A/en
Assigned to DAYCO PRODUCTS, INC. reassignment DAYCO PRODUCTS, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DAYCO CORPORATION
Priority to JP1987077219U priority patent/JPS6366649U/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section

Definitions

  • This invention relates to an improved endless power transmission V-belt construction as well as to a method of making such a belt construction.
  • V-belt construction formed mainly of polymeric material and having rounded top and bottom teeth respectively extending along the length of the top and bottom surfaces of the belt construction, the belt construction comprising a tension section having the top surface, a compression section having the bottom surface, and a load-carrying section disposed intermediate the tension section and the compression section.
  • continuously variable transmission V-belt constructions are each ordinarily constructed with a large aspect ratio (ratio of top width to thickness), usually the quotient of such ratio being between 2.0 and 4.0, in order to provide the greatest possible speed ratio.
  • the top width of the belt construction is determined by the speed ratio and the tension required to transmit power, while the thickness is determined by the need for crosswise support and constrained by the minimum diameter required by the speed ratio and the required tension.
  • V-belt constructions are commonly toothed, notched or corrugated to provide the required flexibility while maintaining enough thickness for crosswise support. Teeth also increase heat transfer rate by increasing surface area and air flow around the belt, round teeth providing the shortest heat flow path to the outside of the belt construction from the center of each tooth. In certain belt construction applications, greater thickness is required to prevent collapse than can be achieved with a single tooth construction and therefore in such cases, the V-belt constructions are toothed both on the tops and bottoms thereof.
  • V-belt construction of the double rounded tooth type allows the maximum total belt construction thickness to be used for maximum crosswise support while providing the minimum “flex thickness" (root plane of top tooth to root plane of bottom tooth) and thereof could be utilized for continuously variable transmission purposes.
  • one embodiment of this invention provides an endless power transmission V-belt construction formed mainly of polymeric material and having rounded top and bottom teeth respectively extending along the length of the top and bottom surfaces of the belt construction, the belt construction comprising a tension section having the top surface, a compression section having the bottom surface, and a load-carrying section disposed intermediate the tension section and the compression section.
  • the quotient of the bottom to top tooth pitch of the belt construction is approximately 1.40 and the quotient of the bottom to top tooth depth thereof is approximately 1.77 while the quotient of the belt thickness to flex thickness is approximately 3.98.
  • Another object of this invention is to provide a method of making such an endless power transmission V-belt construction, the method of this invention having one or more of the novel features of this invention as set forth above or hereinafter shown or described.
  • FIG. 1 is a schematic side view illustrating a typical continuously variable transmission unit.
  • FIG. 2 is a fragmentary perspective view, partially in cross section, of the improved endless power transmission V-belt construction of this invention.
  • FIG. 3 is an enlarged fragmentary side view of the belt construction of FIG. 2.
  • a typical continuously variable transmission unit for a transportation vehicle or the like is generally indicated by the reference numeral 20 and comprises a pair of adjustable sheave drive and driven pulleys 21 and 22 being respectively rotatably mounted by drive and driven shafts 23 and 24 having an endless power transmission V-belt construction 25 drivenly and drivingly disposed around the pulleys 21 and 22 which respectively can have the sheaves thereof adjusted in a manner well known in the art to have the belt construction 25 be looped between maximum and minimum diameters as respectively represented by the arrows 26 and 27 in FIG. 1 in order to provide a continuously variable drive in a manner well known in the art.
  • the V-belt construction 25 is ordinarily constructed with a large aspect ratio (ratio of top width to thickness), such as where the quotient of such ratio is between 2.0 and 4.0.
  • Such an endless power transmission V-belt construction is provided by this invention and is generally indicated by the reference numeral 28 in FIGS. 2 and 3 and will now be described.
  • the endless power transmission V-belt construction 28 of this invention comprises a tension section 29 that defines a top surface 30 of the belt construction 28, a compression section 31 that defines a bottom surface 32 of the belt construction 28, and a load-carrying or neutral axis section 33 disposed intermediate the tension section 29 and the compression section 31 in a conventional manner, the load-carrying section 33 comprising a top cushion or layer 34 and a bottom cushion or layer 35 with a load-carrying cord 36 helically wound therebetween in a manner well known in the belt construction art.
  • the belt sections 28, 31 and 33 and cord 36 are formed mainly of polymeric material, and, if desired, at least one of the tension section 29 and the compression section 31 can be fiber loaded (not shown) in a manner well known in the art. Also, if desired, one or more fabric layers, such as fabric layer 37 in FIGS. 2 and 3, can be disposed on at least one of the top and bottom surfaces 30 and 32 in a manner well known in the art.
  • any suitable polymeric material can be utilized for the sections 29, 31 and 33, the same can comprise mainly neoprene with conventional fillers and binders as is conventional in the belt art.
  • the tension section 29 of the belt construction 28 is formed with a plurality of rounded teeth 38 that extend substantially transverse to the longitudinal axis of the belt construction 28 and are substantially uniform to each other while extending along the entire length of the top surface 30 thereof as illustrated, the teeth 38 sometimes being referred to as cogs.
  • the compression section 31 of the belt construction 28 has a plurality of bottom teeth 39 formed therein that extend substantially transverse to the longitudinal axis to the belt construction 28, are substantially uniform to each other and extend along the entire length of the bottom surface 32 of the belt construction 28 as illustrated, the teeth 39 also sometimes being referred to as cogs.
  • belt construction 28 of this invention can be made in any manner known in the art for producing double toothed belts or as sometimes referred to as double cogged belts, such as by forming the bottom teeth as set forth in U.S. Pat. No. 1,611,829; 3,464,875 or 4,106,966 (which three U.S. patents are being incorporated into this disclosure by this reference thereto) and by forming the top teeth as set forth in U.S. Pat. No.
  • the belt construction 28 of this invention is formed so that the quotient of the aspect ratio thereof, as defined by the top width of the belt construction 28 that is indicated by the reference numeral 41 in FIG. 2 and by the belt thickness that is indicated by the reference numeral 42 in FIG. 3, is between 2.0 and 4.0 in order to provide a variable speed V-belt construction.
  • the top and bottom teeth 38 and 39 should have the following pitch, tooth depth, tooth tip radii and root radii when considering a substantially straight section thereof and the following flex thickness in order to comprise the unique endless power transmission V-belt construction of this invention wherein the quotient of the bottom to top tooth pitch is approximately 1.40, the quotient of the bottom to top tooth depth is approximately 1.77 and the quotient of the belt thickness to flex thickness is approximately 3.98.
  • the flex thickness of the particular belt construction 28 of this invention is represented by the reference numeral 43 in FIG. 3 and is approximately 0.188 of an inch.
  • the pitch of the top teeth 38 of the belt construction 28 of this invention is represented by the reference numeral 44 in FIG. 3 and is approximately 0.3908 of an inch while the pitch of the bottom teeth 39 is represented by the reference numeral 45 in FIG. 3 and is approximately 0.547 of an inch.
  • the root depth of the top teeth 38 of the belt construction 28 of this invention is represented by the reference numeral 46 in FIG. 3 and is approximately 0.203 of an inch while the root depth of the bottom teeth 39 is represented by the reference numeral 47 in FIG. 3 and is approximately 0.359 of an inch.
  • the radius for defining the rounded tips of the top teeth 38 of the belt construction 28 of this invention is represented by radius arrow 48 in FIG. 3 and is approximately 0.141 of an inch while the tooth tip radius of the bottom teeth 39 is represented by the radius arrow 49 in FIG. 3 and is approximately 0.156 of an inch.
  • the root radius of the top teeth 38 of the belt construction 28 of this invention is indicated by the radius arrow 50 in FIG. 3 and is approximately 0.047 of an inch while the root radius of the bottom teeth 39 is indicated by the radius arrow 51 in FIG. 3 and is approximately 0.078 of an inch.
  • this invention not only provides an improved endless power transmission V-belt construction, but also this invention provides an improved method of making such a belt construction.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmissions By Endless Flexible Members (AREA)
  • Laminated Bodies (AREA)
US06/348,106 1982-02-11 1982-02-11 Endless power transmission V-belt construction and method of making the same Expired - Fee Related US4410314A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US06/348,106 US4410314A (en) 1982-02-11 1982-02-11 Endless power transmission V-belt construction and method of making the same
EP83901127A EP0100361B1 (en) 1982-02-11 1983-02-09 Endless power transmission v-belt construction
JP58501218A JPS59500007A (ja) 1982-02-11 1983-02-09 無端伝動ｖベルト構造体およびその製造方法
PCT/US1983/000195 WO1983002809A1 (en) 1982-02-11 1983-02-09 Endless power transmission v-belt construction and method of making the same
GB08324225A GB2125143B (en) 1982-02-11 1983-02-09 Endless power transmission v-belt construction and method of making the same
DE833332118T DE3332118T1 (de) 1982-02-11 1983-02-09 Endloser keilriemen und herstellungsverfahren
US06/522,422 US4494947A (en) 1982-02-11 1983-08-11 Endless power transmission V-belt construction and method of making the same
SE8305589A SE8305589L (sv) 1982-02-11 1983-10-11 Endlos transmissionskilrem och sett for dess framstellning
US06/654,830 US4559029A (en) 1982-02-11 1984-09-26 Endless power transmission V-belt constructions
JP1987077219U JPS6366649U ( ) 1982-02-11 1987-05-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/348,106 US4410314A (en) 1982-02-11 1982-02-11 Endless power transmission V-belt construction and method of making the same

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US06/522,422 Continuation US4494947A (en) 1982-02-11 1983-08-11 Endless power transmission V-belt construction and method of making the same
US06/522,422 Division US4494947A (en) 1982-02-11 1983-08-11 Endless power transmission V-belt construction and method of making the same

Publications (1)

Publication Number Publication Date
US4410314A true US4410314A (en) 1983-10-18

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Family Applications (3)

Application Number Title Priority Date Filing Date
US06/348,106 Expired - Fee Related US4410314A (en) 1982-02-11 1982-02-11 Endless power transmission V-belt construction and method of making the same
US06/522,422 Expired - Lifetime US4494947A (en) 1982-02-11 1983-08-11 Endless power transmission V-belt construction and method of making the same
US06/654,830 Expired - Lifetime US4559029A (en) 1982-02-11 1984-09-26 Endless power transmission V-belt constructions

Family Applications After (2)

Application Number Title Priority Date Filing Date
US06/522,422 Expired - Lifetime US4494947A (en) 1982-02-11 1983-08-11 Endless power transmission V-belt construction and method of making the same
US06/654,830 Expired - Lifetime US4559029A (en) 1982-02-11 1984-09-26 Endless power transmission V-belt constructions

Country Status (7)

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US (3) US4410314A ( )
EP (1) EP0100361B1 ( )
JP (2) JPS59500007A ( )
DE (1) DE3332118T1 ( )
GB (1) GB2125143B ( )
SE (1) SE8305589L ( )
WO (1) WO1983002809A1 ( )

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4559029A (en) * 1982-02-11 1985-12-17 Dayco Corporation Endless power transmission V-belt constructions
US4702729A (en) * 1986-02-10 1987-10-27 Mitsuboshi Belting Ltd. Timing belt with controlled friction backside ribs
US4838843A (en) * 1982-04-16 1989-06-13 The Gates Rubber Company Toothed belt
US6620068B2 (en) * 2000-04-28 2003-09-16 Mitsuboshi Belting Ltd. Power transmission belt
US20040014544A1 (en) * 2000-04-28 2004-01-22 Takehiko Ito Power transmission belt and a method of forming a power transmission belt
US20040109986A1 (en) * 1999-07-08 2004-06-10 Saint-Gobain Performance Plastics Corporation Flexible composites with integral flights for use in high-temperature food processing equipment and methods for producing the same
US20050103573A1 (en) * 2002-01-16 2005-05-19 Marler Mark E. Elevator system design including a belt assembly with a vibration and noise reducling groove configuration
US20050239585A1 (en) * 2004-04-26 2005-10-27 Honda Motor Co., Ltd. V-belt type automatic transmission
US20160040749A1 (en) * 2013-03-28 2016-02-11 Mitsuboshi Belting Ltd. Transmission Belt and Belt-Speed-Change Device
US10450141B2 (en) 2016-11-29 2019-10-22 Saint-Gobain Performance Plastics Corporation Composite belt profile

Families Citing this family (26)

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Publication number Priority date Publication date Assignee Title
GB2143924B (en) * 1983-06-03 1986-10-29 Continental Gummi Werke Ag V-belt
US4829433A (en) * 1985-10-07 1989-05-09 Nissan Motor Co., Ltd. Control system for continuously variable transmission
JPH0712811B2 (ja) * 1985-11-25 1995-02-15 日産自動車株式会社 無段変速機の制御装置
JPH0765661B2 (ja) * 1986-09-08 1995-07-19 日産自動車株式会社 無段変速機の変速制御装置
JPH07456B2 (ja) * 1986-09-19 1995-01-11 日産自動車株式会社 無段変速機の変速制御装置
US5273496A (en) * 1991-06-18 1993-12-28 Dayco Products, Inc. Belt construction, the combination of the belt construction and a puley and methods of making the same
US5171389A (en) * 1991-11-08 1992-12-15 Albany International Corp. Spiral construction of grooved long nip press
JP2503710Y2 (ja) * 1992-01-16 1996-07-03 三ツ星ベルト株式会社 動力伝動用ｖベルト
IT1265351B1 (it) * 1993-11-26 1996-11-22 Dayco Pti Spa Trasmissione a cinghia dentata per il comando di alberi di equilibratura dinamica in motori endotermici
US5957797A (en) * 1996-09-04 1999-09-28 Wright State University Automatic change transmission utilizing continuous elastic drive belt and method
CA2313421A1 (en) * 1999-08-26 2001-02-26 The Goodyear Tire & Rubber Company Power transmission belt
KR200257951Y1 (ko) * 2001-09-06 2001-12-24 주식회사 리마 휴대용 미니 스쿠터의 동력전달장치
US6826811B2 (en) * 2002-06-21 2004-12-07 Adams Mfg. Corp. Jaw-type clip
US8075434B2 (en) * 2003-08-06 2011-12-13 Dayco Products, Llc Profiled tip power transmission belt
US20050159262A1 (en) * 2004-01-21 2005-07-21 Brecoflex Co., L.L.C. Timing belt with wave glide surface
JP4671742B2 (ja) * 2005-04-14 2011-04-20 ニッタ株式会社 平ベルト
US8002922B2 (en) * 2005-07-19 2011-08-23 Mitsuboshi Belting Ltd. Power transmission belt and method of making a power transmission belt
US7458883B2 (en) * 2006-01-31 2008-12-02 B A Werk Industries Ltd. Apparatus for abrading a surface
US8206251B2 (en) * 2009-04-30 2012-06-26 The Gates Corporation Double cogged V-belt for variable speed drive
US20130190120A1 (en) * 2009-04-30 2013-07-25 The Gates Corporation Double cogged v-belt for variable speed drive
KR101871033B1 (ko) * 2012-07-26 2018-06-25 반도 카가쿠 가부시키가이샤 노치를 갖는 전동 벨트
WO2014048123A1 (zh) * 2012-09-29 2014-04-03 Wang Jinfang V型带轮
WO2014185030A1 (ja) * 2013-05-15 2014-11-20 バンドー化学株式会社 歯付ベルト及びその製造方法、ベルト伝動装置
CN109196246B (zh) * 2016-05-20 2019-09-24 阪东化学株式会社 带齿v带及使用了该带齿v带的传动系统
US10882719B2 (en) * 2018-03-29 2021-01-05 Thyssenkrupp Elevator Ag Composite elevator belt
US10926976B2 (en) * 2018-06-18 2021-02-23 Otis Elevator Company Belt with corrugated material

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US1890080A (en) * 1928-08-08 1932-12-06 Abraham L Freedlander Double cog belt
US3988941A (en) * 1975-08-01 1976-11-02 Smith Thomas R Drive belt
US4131030A (en) * 1977-11-02 1978-12-26 Dayco Corporation Covering for power transmission belt
US4137787A (en) * 1977-11-07 1979-02-06 Dayco Corporation Emergency stretch belt
US4228692A (en) * 1977-08-15 1980-10-21 Dayco Corporation Endless power transmission belt and method of manufacture

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US2699685A (en) * 1950-04-29 1955-01-18 Dayton Rubber Company Double cog belt
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DE2332052C3 (de) * 1973-06-23 1981-10-22 Continental Gummi-Werke Ag, 3000 Hannover Aus Gummi oder elastischen Kunststoffen hergestellter Zahnriemen
US4106966A (en) * 1977-05-20 1978-08-15 Dayco Corporation Method of making toothed endless power transmission belts
US4011766A (en) * 1976-02-19 1977-03-15 Dayco Corporation Endless power transmission belt
US4276039A (en) * 1979-05-03 1981-06-30 Mitsuboshi Belting Ltd. Adjustless V-belt and method of manufacturing
US4332576A (en) * 1980-01-11 1982-06-01 The Gates Rubber Company V-Belt
US4410314A (en) * 1982-02-11 1983-10-18 Dayco Corporation Endless power transmission V-belt construction and method of making the same

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
US1890080A (en) * 1928-08-08 1932-12-06 Abraham L Freedlander Double cog belt
US3988941A (en) * 1975-08-01 1976-11-02 Smith Thomas R Drive belt
US4228692A (en) * 1977-08-15 1980-10-21 Dayco Corporation Endless power transmission belt and method of manufacture
US4131030A (en) * 1977-11-02 1978-12-26 Dayco Corporation Covering for power transmission belt
US4137787A (en) * 1977-11-07 1979-02-06 Dayco Corporation Emergency stretch belt

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4559029A (en) * 1982-02-11 1985-12-17 Dayco Corporation Endless power transmission V-belt constructions
US4838843A (en) * 1982-04-16 1989-06-13 The Gates Rubber Company Toothed belt
US4702729A (en) * 1986-02-10 1987-10-27 Mitsuboshi Belting Ltd. Timing belt with controlled friction backside ribs
US7278350B2 (en) 1999-07-08 2007-10-09 Saint-Gobain Performance Plastics Belts with integral flights for use in high-temperature food processing equipment and systems including such belts
US9138944B2 (en) 1999-07-08 2015-09-22 Saint-Gobain Performance Plastics Corporation Belts with integral flights for use in high-temperature food processing equipment and systems including such belts
US20040109986A1 (en) * 1999-07-08 2004-06-10 Saint-Gobain Performance Plastics Corporation Flexible composites with integral flights for use in high-temperature food processing equipment and methods for producing the same
US20090114101A1 (en) * 1999-07-08 2009-05-07 Saint-Gobain Performance Plastics Corporation Belts with integral flights for use in high-temperature food processing equipment and systems including such belts
US6919122B2 (en) * 1999-07-08 2005-07-19 Saint-Gobain Performance Plastics Corporation Flexible composites with integral flights for use in high-temperature food processing equipment and methods for producing the same
US7487578B2 (en) 1999-07-08 2009-02-10 Saint-Gobain Performance Plastics Corporation Method for forming belts with integral flights for use in high-temperature food processing equipment
US20040014544A1 (en) * 2000-04-28 2004-01-22 Takehiko Ito Power transmission belt and a method of forming a power transmission belt
US6962639B2 (en) 2000-04-28 2005-11-08 Mitsuboshi Belting Ltd. Power transmission belt and a method of forming a power transmission belt
US6620068B2 (en) * 2000-04-28 2003-09-16 Mitsuboshi Belting Ltd. Power transmission belt
US20050103573A1 (en) * 2002-01-16 2005-05-19 Marler Mark E. Elevator system design including a belt assembly with a vibration and noise reducling groove configuration
US7748501B2 (en) 2002-01-16 2010-07-06 Otis Elevator Company Elevator system design including a belt assembly with a vibration and noise reducing groove configuration
US20050239585A1 (en) * 2004-04-26 2005-10-27 Honda Motor Co., Ltd. V-belt type automatic transmission
US20160040749A1 (en) * 2013-03-28 2016-02-11 Mitsuboshi Belting Ltd. Transmission Belt and Belt-Speed-Change Device
US10591020B2 (en) * 2013-03-28 2020-03-17 Mitsuboshi Belting Ltd. Transmission belt and belt-speed-change device
US10450141B2 (en) 2016-11-29 2019-10-22 Saint-Gobain Performance Plastics Corporation Composite belt profile
US10625943B2 (en) 2016-11-29 2020-04-21 Saint-Gobain Performance Plastics Corporation Composite belt profile

Also Published As

Publication number Publication date
EP0100361A4 (en) 1984-04-24
JPS59500007A (ja) 1984-01-05
DE3332118T1 (de) 1984-01-12
EP0100361B1 (en) 1986-07-23
US4494947A (en) 1985-01-22
EP0100361A1 (en) 1984-02-15
JPS6366649U ( ) 1988-05-06
SE8305589D0 (sv) 1983-10-11
GB2125143A (en) 1984-02-29
GB2125143B (en) 1985-09-18
GB8324225D0 (en) 1983-10-12
WO1983002809A1 (en) 1983-08-18
US4559029A (en) 1985-12-17
SE8305589L (sv) 1983-10-11

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